@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+Devanagari:wght@100..900&display=swap');

  /* ========== RESET & GLOBAL ========== */
  * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
  }

  body {
      font-family: "Noto Sans Devanagari", sans-serif;
      background: radial-gradient(circle at 10% 30%, #0f172a, #020617);
      min-height: 100vh;
      color: #eef2ff;
      line-height: 1.5;
      /* padding: 1rem; */
  }

  .container-quiz {
      max-width: 1000px;
      margin: 0 auto;
      padding: 0.75rem;
      margin-bottom: 4rem;
  }

  /* ========== 3D BOX SHADOW & BORDER EFFECTS ========== */
  .set-card,
  .quiz-card,
  .result-card {
      background: rgba(255, 255, 255, 0.08);
      backdrop-filter: blur(12px);
      border-radius: .8rem;
      border: 1px solid rgba(139, 92, 246, 0.4);
      box-shadow: 0 25px 45px -12px rgba(0, 0, 0, 0.5), 0 4px 12px rgba(0, 0, 0, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.1);
      transition: all 0.35s cubic-bezier(0.2, 0.9, 0.4, 1.1);

  }

  .set-card:hover {
      transform: translateY(-8px) scale(1.01);
      box-shadow: 0 35px 50px -18px rgba(0, 0, 0, 0.6), 0 0 0 2px rgba(99, 102, 241, 0.5);
      border-color: #c084fc;
  }

  .quiz-card {
      background: rgba(15, 23, 42, 0.8);
      backdrop-filter: blur(16px);
      padding: 1.8rem 2rem;
      margin: 1.5rem auto;
      max-width: 800px;
  }

  .quiz-card:hover {
      box-shadow: 0 28px 48px -12px rgba(0, 0, 0, 0.6), inset 0 0 0 1px rgba(255, 255, 255, 0.15);
      border-color: #a78bfa;
  }

  /* ========== 3D BUTTON STYLES ========== */
  .set-card button,
  .back-btn,
  .nav-btn,
  .option {
      transition: all 0.12s linear;
      box-shadow: 0 6px 0 rgba(0, 0, 0, 0.25);
      border: none;
      cursor: pointer;
      font-weight: 500;
  }

  .set-card button:active,
  .back-btn:active,
  .nav-btn:active,
  .option:active {
      transform: translateY(3px);
      box-shadow: 0 2px 0 rgba(0, 0, 0, 0.25);
  }

  /* primary 3D gradient button */
  .set-card button,
  .nav-btn.next {
      background: linear-gradient(120deg, #4f46e5, #c026d3);
      color: white;
      border-radius: .8rem;
      font-size: 1.1rem;
      padding: 0.9rem 1.5rem;
      box-shadow: 0 10px 0 -2px #2e1065, 0 8px 20px rgba(0, 0, 0, 0.3);
      letter-spacing: 0.5px;
  }

  .set-card button:active,
  .nav-btn.next:active {
      transform: translateY(5px);
      box-shadow: 0 4px 0 -1px #2e1065;
  }

  .back-btn {
      background: #1e293b;
      color: #cbd5e1;
      width: 48px;
      height: 48px;
      border-radius: 24px;
      font-size: 1.4rem;
      box-shadow: 0 5px 0 #0f172a;
      display: flex;
      align-items: center;
      justify-content: center;
  }

  .nav-btn:first-child {
      background: #334155;
      color: #f1f5f9;
      border-radius: 24px;
      box-shadow: 0 5px 0 #1e293b;
      padding: 0.8rem 2rem;
  }

  /* 3D option buttons */
  .option {
      background: rgba(30, 41, 59, 0.95);
      border: 1px solid #475569;
      border-radius: .8rem;
      padding: 1rem 1.5rem;
      color: #f1f5f9;
      font-weight: 500;
      backdrop-filter: blur(4px);
      box-shadow: 0 5px 0 #0f172a;
      width: 100%;
      text-align: left;
      font-size: 1rem;
      transition: all 0.2s;
  }

  .option:hover:not(:disabled) {
      transform: translateY(-2px);
      background: #4f46e5cc;
      border-color: #a78bfa;
      box-shadow: 0 8px 0 #2e1065;
  }

  .option.correct {
      background: #15803dcc;
      border-color: #4ade80;
      box-shadow: 0 5px 0 #14532d;
      color: white;
  }

  .option.wrong {
      background: #b91c1ccc;
      border-color: #f87171;
      box-shadow: 0 5px 0 #7f1a1a;
      text-decoration: line-through;
  }

  .option:disabled {
      cursor: default;
      opacity: 0.9;
  }

  /* ========== TIMER 3D CIRCLE ========== */
  .timer-container-quiz {
      background: radial-gradient(circle at 30% 20%, #1e293b, #0f172a);
      width: 50px;
      height: 50px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      border: 3px solid #c084fc;
      box-shadow: 0 12px 25px rgba(0, 0, 0, 0.5), inset 0 1px 2px rgba(255, 255, 255, 0.2);
      font-weight: 500;
      font-size: 1.3rem;
      color: #facc15;
      transition: 0.2s;
  }

  .timer-container-quiz.low {
      border-color: #ef4444;
      color: #ffb3b3;
      animation: pulseWarning 0.9s infinite;
      box-shadow: 0 0 12px #ef4444;
  }

  @keyframes pulseWarning {
      0% {
          transform: scale(1);
          border-color: #ef4444;
      }

      70% {
          transform: scale(1.08);
          border-color: #ff8c8c;
      }

      100% {
          transform: scale(1);
          border-color: #ef4444;
      }
  }

  /* ========== PROGRESS BAR 3D ========== */
  .progress-container-quiz {
      background: #1e293b;
      border-radius: 24px;
      height: 12px;
      box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.5), 0 1px 0 rgba(255, 255, 255, 0.1);
      margin: 1.5rem 0 1.2rem;
  }

  .progress-bar {
      background: linear-gradient(95deg, #c084fc, #6366f1, #f472b6);
      border-radius: 24px;
      width: 0%;
      height: 100%;
      box-shadow: 0 0 8px #a855f7;
      transition: width 0.4s cubic-bezier(0.2, 0.9, 0.4, 1.1);
  }

  /* ========== HEADER & TYPOGRAPHY ========== */
  .header h1 {
      font-size: 1.8rem;
      background: linear-gradient(135deg, #f0f9ff, #d9f99d, #fbcfe8);
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
      text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
      letter-spacing: -0.5px;
  }

  .header {
      text-align: center;
      margin: 4px auto;
  }

  .question-text {
      font-size: 1.3rem;
      font-weight: 400;
      color: #f1f5f9;
      text-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
      margin-bottom: 1.5rem;
      line-height: 1.4;
      text-align: justify;
  }

  /* ========== EXPLANATION BOX 3D ========== */
  .explanation-box {
      background: linear-gradient(145deg, #0f172ae6, #020617e6);
      border-left: 6px solid #4ade80;
      padding: 1.3rem;
      border-radius: .8rem;
      margin: 1.7rem 0;
      backdrop-filter: blur(12px);
      box-shadow: 0 12px 20px -8px black;
      text-align: justify;
  }

  /* ========== SET GRID ========== */
  .set-screen {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
      gap: 2rem;
      margin-top: 1rem;
  }

  .set-card {
      padding: 1.8rem;
  }

  .set-card .set-number {
      color: #a78bfa;
      font-weight: 500;
      font-size: 1rem;
      margin-bottom: 0.5rem;
  }

  .set-card h3 {
      font-size: 1.25rem;
      margin: 0.5rem 0 1rem;
      color: #e2e8f0;
  }

  /* ========== QUIZ HEADER ========== */
  .quiz-header {
      display: flex;
      align-items: center;
      gap: 1rem;
      flex-wrap: wrap;
  }

  .quiz-info {
      flex: 1;
  }

  .set-name {
      font-size: 1.2rem;
      font-weight: 600;
      background: linear-gradient(130deg, #c084fc, #f0abfc);
      background-clip: text;
      -webkit-background-clip: text;
      color: transparent;
  }

  .question-count {
      background: #4f46e5;
      padding: 0.4rem 1rem;
      border-radius: 10px;
      font-size: 0.85rem;
      font-weight: 500;
      display: inline-block;
      margin-top: 6px;
      box-shadow: inset 0 -1px 0 #2e1065, 0 2px 6px black;
  }

  /* ========== NAVIGATION ========== */
  .navigation {
      display: flex;
      justify-content: space-between;
      gap: 1rem;
      margin-top: 1.8rem;
  }

  .nav-btn {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      font-size: 1rem;
      border-radius: .8rem;
  }

  /* ========== RESULT SCREEN ========== */
  .result-screen {
      background: rgba(0, 0, 0, 0.55);
      backdrop-filter: blur(24px);
      border-radius: 1rem;
      padding: 2.5rem 2rem;
      text-align: center;
      border: 1px solid rgba(167, 139, 250, 0.5);
      animation: fadeInUp 0.6s;
  }

  .score {
      font-size: 4.5rem;
      font-weight: 600;
      background: linear-gradient(145deg, #facc15, #f97316);
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
      margin: 1rem 0;
  }

  .restart-btn {
      background: linear-gradient(120deg, #4f46e5, #c026d3);
      border: none;
      padding: 1rem 2rem;
      border-radius: 1rem;
      font-weight: bold;
      font-size: 1.1rem;
      color: white;
      cursor: pointer;
      box-shadow: 0 8px 0 #2e1065;
      transition: 0.08s linear;
      margin-top: 1rem;
  }

  .restart-btn:active {
      transform: translateY(4px);
      box-shadow: 0 4px 0 #2e1065;
  }

  /* ========== ANIMATIONS ========== */
  @keyframes fadeInUp {
      from {
          opacity: 0;
          transform: translateY(40px);
      }

      to {
          opacity: 1;
          transform: translateY(0);
      }
  }

  .quiz-card,
  .set-card,
  .result-screen {
      animation: fadeInUp 0.5s ease-out;
  }

  /* ========== RESPONSIVE DESIGN (MOBILE & TABLET) ========== */
  @media (max-width: 768px) {
      .container-quiz {
          padding: 0.5rem;
      }

      .quiz-card {
          padding: 1.2rem;
      }

      .question-text {
          font-size: 1.2rem;
      }

      .option {
          padding: 0.8rem 1.2rem;
          font-size: 0.9rem;
      }



      .timer-container-quiz {
          width: 55px;
          height: 55px;
          font-size: 1.3rem;
      }

      .header h1 {
          font-size: 1.9rem;
      }

      .nav-btn {
          padding: 0.6rem 1.2rem;
          font-size: 0.9rem;
      }

      .set-card h3 {
          font-size: 1.1rem;
      }
  }

  @media (max-width: 520px) {
      .quiz-header {
          flex-wrap: wrap;
          justify-content: space-between;
      }

      .quiz-info {
          width: 100%;
          order: 2;
          margin-top: 10px;
          text-align: center;
      }

      .timer-container-quiz {
          order: 1;
      }

      .back-btn {
          order: 0;
      }

      .option {
          font-size: 0.85rem;
          padding: 0.7rem 1rem;
      }

      .set-card button {
          font-size: 1rem;
          padding: 0.7rem;
      }

      .navigation {
          flex-direction: column;
          gap: 0.8rem;
      }

      .nav-btn {
          justify-content: center;
      }

      .score {
          font-size: 3rem;
      }
  }

  @media (min-width: 769px) and (max-width: 1024px) {
      .question-text {
          font-size: 1.35rem;
      }

      .option {
          font-size: 1rem;
          padding: 1rem 1.3rem;
      }

      .set-screen {
          gap: 1.5rem;
      }
  }

  .hidden {
      display: none !important;
  }

  .options-container-quiz {
      display: flex;
      flex-direction: column;
      gap: 0.9rem;
  }

  i,
  .fas {
      pointer-events: none;
  }



  /* ========== MUSIC PLAYER 3D STYLES ========== */
  .music-player {
      position: fixed;
      bottom: 20px;
      right: 20px;
      z-index: 1000;
      background: rgba(15, 23, 42, 0.85);
      backdrop-filter: blur(12px);
      border-radius: 24px;
      padding: 8px 16px 8px 12px;
      display: flex;
      align-items: center;
      gap: 12px;
      border: 1px solid rgba(139, 92, 246, 0.5);
      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(255, 255, 255, 0.05);
      transition: all 0.3s ease;
  }

  .music-player:hover {
      transform: translateY(-3px);
      border-color: #c084fc;
      box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4);
  }

  .music-btn {
      background: linear-gradient(135deg, #4f46e5, #c026d3);
      border: none;
      width: 42px;
      height: 42px;
      border-radius: 50%;
      color: white;
      font-size: 1.2rem;
      cursor: pointer;
      box-shadow: 0 5px 0 #2e1065;
      transition: all 0.08s linear;
      display: flex;
      align-items: center;
      justify-content: center;
  }

  .music-btn:active {
      transform: translateY(3px);
      box-shadow: 0 2px 0 #2e1065;
  }

  .music-info {
      display: flex;
      flex-direction: column;
      font-size: 0.7rem;
      color: #cbd5e1;
  }

  .music-info span:first-child {
      font-weight: 600;
      color: #facc15;
      font-size: 0.75rem;
  }

  .volume-slider {
      width: 80px;
      height: 4px;
      -webkit-appearance: none;
      background: #334155;
      border-radius: 10px;
      outline: none;
      cursor: pointer;
  }

  .volume-slider::-webkit-slider-thumb {
      -webkit-appearance: none;
      width: 12px;
      height: 12px;
      background: #c084fc;
      border-radius: 50%;
      cursor: pointer;
      box-shadow: 0 0 5px #a855f7;
  }

  @media (max-width: 550px) {
      .music-player {
          bottom: 12px;
          right: 12px;
          padding: 5px 12px 5px 8px;
      }

      .music-btn {
          width: 36px;
          height: 36px;
          font-size: 1rem;
      }

      .volume-slider {
          width: 60px;
      }

      .music-info {
          display: none;
      }
  }


  .option-letter {
      width: 30px;
      height: 30px;
      background: #ffffff;
      border-radius: 14px;

      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 0.9rem;
      color: #292828;
      transition: all 0.2s;
      padding: 3px 8px;
      margin-right: .5rem;
  }



  .question-image-container {
      margin: 8px auto;
      text-align: center;
      display: flex;
      justify-content: center;
      align-items: center;
      min-height: 50px;
      background-color: #4ade80;
  }

  .question-image img {
      max-width: 100%;
      max-height: 300px;
      border-radius: 12px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
      object-fit: contain;
      min-height: 150px;
  }

  @media (max-width: 800px) {
      .question-image img {
          min-height: 200px;
      }
  }